A highlighter is a special pen with a wide, pale, bright tip — often yellow, pink, green, or orange — that you pull across words on a page so they jump out when you look back. Students and office workers use it to mark lines they want to find again. The colour is light on purpose: you can still read the print underneath.

A highlighter highlighter（螢光筆） is是 a special pen with a wide, pale, bright tip一種筆頭寬、顏色淺又鮮豔的特殊筆 — often yellow, pink, green, or orange常見黃色、粉紅、綠色，或橘色 — that you pull across words on a page你拿它劃過書頁上的字 so they jump out when you look back這樣你回頭看的時候字就會很顯眼。Students and office workers use it學生和上班族用它 to mark lines they want to find again標出之後還想再找到的那幾行。The colour is light on purpose顏色特意做得很淺: you can still read the print underneath這樣你還是看得到底下印刷的字。

It is highlight + -er, “the thing that highlights.” You highlight with it; the marks are highlights on the page.

It is highlight + -er它是 highlight 加 -er, "the thing that highlights."意思是「用來 highlight 的東西」。You highlight with it你用它來 highlight; the marks are highlights on the page畫出來的痕跡就叫 highlights。

Though actually, people also highlight text on a phone with a finger, and that is the same idea with no pen at all. This word is the pen.

Though actually不過, people also highlight text on a phone with a finger大家也會用手指在手機上 highlight 文字, and that is the same idea with no pen at all概念一樣，只是完全沒有用到筆。This word is the pen但這個字（highlighter）指的是那支筆。

It is a school-bag and desk word, not a formal one.

It is a school-bag and desk word這是書包和書桌上的用字, not a formal one不是正式的說法。